S petefls co



No. 6l9,879. Patented Feb. 2|. I899. J. C. ETCHELLS. LOCKING APPARATUSFOR DOORS OF HOISTS OB LIFTS. (Application filed Aug. 1,1898.) (NoModel.) 3 Sheets-Sheet I.

QQE 1 L I NV ENTO F 6625 21 M HHHHHHHHHH WITNESSES.

No. 6l9,879. Patented Feb. 2|, !899.

J. C. ETGHELLSP LOOKING APPARATUS FOR DOORS 0F HOISTS 0R LIFTS.

a Sheats$heat 3.

(No Model.)

LI G G A g Y 6 A FlG.6.

Fl G.6. INVENTOR elfm WITNESSES.

54m. d/Vm 'rus Nonms vzrzas co.. PHOTO-LIIHQ. mswmcmn. a. c

UNITED STATES PATENT OFFICE.

JOHN CHARLES ETCHELLS, OF HEATON CHAPEL, ENGLAND.

LOCKING APPARATUS FOR DOORS OF HOISTS OR LIFTS.

SPECIFICATION forming part of Letters Patent No. 619,879, dated February21, 1899. Application filed August 1,1898. smi No. 687,470. (No model.)

To ail whom it may concern.-

Be it known that I, JOHN CHARLES EToH- ELLS, of Heaton Chapel, nearStockport, in the county of Lancaster, England, have invented certainnew and useful Improvements in Looking Apparatus for the Doors of Hoistsor Lifts, of which the following is a specification.

This invention is designed to provide im-' proved mechanism for lockingthe doors of hoist-wells and insuring them being maintained closed Whenthe cage is at a different level. The cage when level with the floorautomatically releases or disengages the locking-gear, permitting thedoors to be opened by the attendants.

It consists, essentially, in the application to or combination with thedoors of the hoist of a rocking shaft (operated by the passage of thecage) which actuates two sets of bolts or catches which engage thedoors, one set to lock or hold the doors closed when the cage is absentand the other set to hold the doors open against the force of a springor weight when the cage is stopped opposite the doors and release themagain when the cage moves away. It will be fully described withreference to the accompanying drawings, in which the invention is shownapplied both to the bottom and top of the hoist-doors.

Figure 1 is a front elevation with doors closed, showing the inventionplaced below the doors unlocked. Fig. 2 is a transverse section withcage at level of floor in position to unlock the doors. Fig. 3 is atransverse section with cage removed from level and doors locked. Fig. 4is a plan of Fig. 1, showing locking device; Fig. at, sectional plan online :0 00, Fig. 1. Fig. 5 is a perspective View of the apparatus asarranged for the bottom of the doors. Fig. 6 is a front elevationshowing the invention placed above the doors. Fig. 7 is a transversesection of same. Fig. 8 is a plan of Fig. 6.

Across the bottom or across the top of the doorway A is fitted a rockingshaft B, preferably square in cross-section and mounted in bearings 19in a suitable framework or casting 0, so as to be capable of part of arevolution about its axisfirst in one direction and then in the other.

At or near the center of the rocking shaft B is fixed a lever D, whichis oscillated or caused to rise and fall at its free end by the rotarymovement of the shaft. To the casting or framing (3 two bolts E E arepivoted, with the lower ends of which the free end of the oscillatinglever D engages. The bolts E E are preferably of bell-crank or othersuitable form. To each bolt is attached a spring 6 e, by which it ismoved in one direction, while it is operated or moved in the oppositedirection by the end of the lever D. The bolts E E hold the doors G whenclosed. To the rocking shaft B are also connected two additional bolts FF, mounted on a radial arm or spring f f, bolted to the shaft B. Thesebolts engage the doors when open and hold them against the closing forceor pressure of the springs g.

A lever His affixed at one end or other con- .venient position upon therocking shaft B,

carrying a wheel or runner h at the end to engage a cam or striker K onthe cage L, by which the shaft is oscillated.

In operation the bolts E E, which engage the doors G to hold themclosed, are held by the springs e e in the normal position to lock thedoors when the cage L is absent. When the cage comes opposite to thedoorwayA and level with the floor, the cam or striker K comes in contactwith the wheel h on the lever H and rotates the shaft B part of arevolution. This movement moves the lever D, which acts upon the innerends of the bolt-levers E E and causes them to release the doors G. Thesame movement of the shaft B projects the bolts F F to engage the doorswhen opened and hold them open. The cage when passing a floor-levelwithout stopping simply unlocks the doors and immediately locks themagain.

What I claim as my invention, and desire to protect by Letters Patent,is-

1. In apparatus for operating the doors of hoists, the combination withthe hoist-doors G and cage L of the rocking shaft B, the lever Dextending at one side and oscillated by the rocking shaft, the twolocking-bolts pivoted to the frame 0 engaged by the lever D, the springse e by which the bolts are actuated in one direction, the lever H havingrunner h by which the rocking shaft is oscillated, and the cam-piece Kafiixed to the cage, substantially as described.

2. In apparatus for operating the doors of hoists, the combination withthe doors G and cage L, of the casing C, the rocking shaft B journaledtherein, the lever D extending at one side and oscillated with theshaft, the pivoted bolts E E which hold the doors when closed engaged atone end by the lever D, the springs e 6 attached to the bolts foroperating the bolts in one direction, .the bolts F F connected to therocking shaft which hold the doors open, the lever H having runner h andfixed on the rocking shaft and the z 5 cam-piece K on the cageL whichengages the lever H on the rocking shaft, substantially as described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing 20 witnesses.

JOHN CHARLES ETCI'IELLS.

lVitnesses:

J. OWDEN OBRIEN, JOSEPH BATES.

